HELP 15x8 rally rims identify width. Is there a stamp on them

[Dave W]

Hello,
I am looking for some 15x8 rally wheels for my 1978 2wd custom deluxe.
5 lug 5x5 pattern
Looking on sights like craigslist a lot of people have them for sale stating there
15x8's (they still have tires on em) but they look like 15x7's in the pics
Is there any hard stamp on the rim to identify the width size?

[zieg85]

They are stamped on the inside. You can measure the spot that a trim ring covers up and it should tell you.